316643881 has 4 divisors (see below), whose sum is σ = 316685764. Its totient is φ = 316602000.

The previous prime is 316643869. The next prime is 316643897. The reversal of 316643881 is 188346613.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 165353881 + 151290000 = 12859^2 + 12300^2 .

It is a cyclic number.

It is not a de Polignac number, because 316643881 - 2⁵ = 316643849 is a prime.

It is a super-2 number, since 2×316643881² = 200526694749484322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (316143881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6090 + ... + 25891.

It is an arithmetic number, because the mean of its divisors is an integer number (79171441).

Almost surely, 2^316643881 is an apocalyptic number.

It is an amenable number.

316643881 is a deficient number, since it is larger than the sum of its proper divisors (41883).

316643881 is an equidigital number, since it uses as much as digits as its factorization.

316643881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41882.

The product of its digits is 82944, while the sum is 40.

The square root of 316643881 is about 17794.4901865718. The cubic root of 316643881 is about 681.5907689310.

The spelling of 316643881 in words is "three hundred sixteen million, six hundred forty-three thousand, eight hundred eighty-one".